A defensive conference, held at the pitcher's mound, is concluded when:

• A. The coach leaves the dirt area of the mound.
• B. The infielders leave to go to their positions.
• C. A minute has elapsed.
• D. The coach crosses the foul line.

Answer: (D)

Defensive mound conferences are brief, official breaks in play where the defense talks with the pitcher. The moment the coach crosses the foul line signals the end of that conference and the defense can return to normal play. That crossing is the recognized boundary that officially ends the visit, so the pitcher can resume pitching and the ball state returns to live action. The other options don’t serve as the official termination cue: simply leaving the dirt area isn’t the defined end, the rule doesn’t rely on a time limit like a minute elapsing, and the infielders’ movement back to their positions is a consequence of the conference ending, not the trigger.